In the algorithm, while N-1 reliability constraints are satisfied, the number of exclusive tie lines, reserve capacities of feeders and transformers, and total cost of tie lines are minimized. 在满足变电站以及变压器水平N&1准则前提下,该方法尽量减少专用联络干线数量以及变压器、线路备用容量,求得使空载联络线固定投资最小的联络方案,并且易于计算机实现。